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Atomistic Spin DynamicsFoundations and Applications$
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Olle Eriksson, Anders Bergman, Lars Bergqvist, and Johan Hellsvik

Print publication date: 2017

Print ISBN-13: 9780198788669

Published to Oxford Scholarship Online: May 2017

DOI: 10.1093/oso/9780198788669.001.0001

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(p.154) 9 Magnons
Atomistic Spin Dynamics

Olle Eriksson

Anders Bergman

Lars Bergqvist

Johan Hellsvik

Oxford University Press

In this chapter we give several examples of how the multiscale approach for atomistic spin-dynamics, as described in Part I and Part II of this book, performs for describing magnon excitations of solids. Due to the recent experimental advancements in detecting such excitations for surfaces and multilayers, we focus here primarily on spin wave excitations of two-dimensional systems. The discussion can easily be generalized to bulk magnets, and in fact some examples of bulk properties are given in this chapter as well. Magnons can be categorized as dipolar and exchange magnons, where the latter are in the range of giga Hz frequency, and are the main focus of this chapter.

Keywords:   Dispersion relation, Stoner continuum, Landau damping, life time, adiabatic magnon spectra, frozen magnon, SPEELS, surface magnon, dynamical magnetic susceptibility

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